The International Association for Cryptologic Research (IACR) is a non-profit scientific organization whose purpose is to further research in cryptology and related fields. The IACR sponsors some of the major conferences and workshops in the field of cryptography, publishes the Journal of Cryptology, and maintains the Cryptology ePrint Archive.

The IACR sponsors three annual conferences, Crypto, Eurocrypt and Asiacrypt; and four annual workshops, Fast Software Encryption (FSE), Public Key Cryptography (PKC), Cryptographic Hardware and Embedded Systems (CHES) and the Theory of Cryptography Conference (TCC). A few other conferences and workshops are affiliated to the IACR.

The IACR was organised at the initiative of David Chaum at CRYPTO '82. CRYPTO '83 was the first conference officially sponsored by the IACR. In 2000, IACR had approximately 1000 members and its current president is Bart Preneel.